Hi Karl. What about org-caldav [1]? Not quite what you want but if you sync with a calendar that can be shared, it does in effect achieve your goal. I do this with google's calendar which I can indeed share with others.
Mind you, syncing with google calendar is deprecated due to authentication issues, but that's another story. eric Footnotes: [1] https://github.com/dengste/org-caldav -- : Eric S Fraga (0xFFFCF67D), Emacs 24.4.50.2, Org release_8.2.6-966-g6cdf1b
